CN110886136A - Coated paper and processing method thereof - Google Patents
Coated paper and processing method thereof Download PDFInfo
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- CN110886136A CN110886136A CN201811056560.3A CN201811056560A CN110886136A CN 110886136 A CN110886136 A CN 110886136A CN 201811056560 A CN201811056560 A CN 201811056560A CN 110886136 A CN110886136 A CN 110886136A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/385—Oxides, hydroxides or carbonates
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/52—Cellulose; Derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/54—Starch
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/08—Dispersing agents for fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/12—Defoamers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
Abstract
The invention relates to the technical field of paper processing, in particular to coated paper, which comprises base paper and coating layers, wherein the coating layers are coated on two sides of the base paper; the coating layer comprises the following raw material components in parts by weight: 35-70 parts of rubber powder, 50-80 parts of nano calcium carbonate, 5-15 parts of microcrystalline cellulose, 0.5-1.5 parts of titanium dioxide, 0.1-0.5 part of dispersing agent and 1-3 parts of defoaming agent; the glue powder comprises starch and peach gum powder, and the mass ratio of the starch to the peach gum powder is (3: 2) - (25: 4); the processing method is provided, and the adhesive force and durability of the paper base and the coating layer are improved by modifying the paper base and matching with special rubber powder, so that the printing effect of the coated paper is improved; the super-strong carrier obtained by compatibility greatly improves the adsorption performance of the coating layer, can effectively play a role in moisture absorption and moisture prevention, prolongs the storage life of the coated paper, and improves the comprehensive performance of the coated paper.
Description
Technical Field
The invention relates to the technical field of paper processing, in particular to coated paper and a processing method thereof.
Background
Coated paper is also called printing coated paper. The surface of the base paper is coated with a layer of white coating and is formed by supercalendering, and the paper surface is divided into a light splitting surface and a cloth pattern. The paper has smooth surface, high whiteness and good ink absorption and absorption performance. It is mainly used for offset printing and gravure printing of fine-mesh printed matters, such as high-grade picture books, calendars, insets in books and periodicals, covers of high-grade books and periodicals, color pictures, various exquisite commercial advertisements, samples, commercial packages, trademarks and the like.
Because the surface of the coated paper is smooth and the ink absorption capacity is poor, the deep ink thin printing needs to be ensured as much as possible when the solid plate with a large page is printed. The ink phase is properly adjusted to be darker, so that the ink layer is corresponding or thinner during printing, the requirement of the printing hue can be met, the chance of printing over the bottom can be reduced, and the phenomenon that the color cannot be printed in a superimposed manner can be prevented. However, most of the coated papers in the prior art have poor paper adhesion, and the printed ink layer is easy to discolor due to dusting, thereby affecting the printing effect of the coated papers.
In the traditional process, because the surface of the coated paper is glued or coated with more coating layers, the phenomena of powder removal and black shadow on the surface of a printed matter are frequently encountered in the printing process, and the printing effect and the printing performance of the coated paper are influenced. To avoid this, care is taken to check the plate loading process operations, such as the presence or absence of a pad in the plate; if the pressure on the paper surface is too high, the coating powder on the surface layer of the coated paper is easily crushed, and powder removal and shadow spots are caused.
In addition, most of the prior art coated papers have poor moisture resistance, and once the coated papers are wetted, the powder is easy to stick and fall off and cannot be stored for a long time, so that the comprehensive performance of the coated papers is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the coated paper, which improves the adhesive force and the durability of a paper base and a coating layer by modifying the paper base and matching with special rubber powder, thereby improving the printing effect of the coated paper; the super-strong carrier obtained by compatibility greatly improves the adsorption performance of the coating layer, can effectively play a role in moisture absorption and moisture prevention, prolongs the storage life of the coated paper, and improves the comprehensive performance of the coated paper.
The purpose of the invention is realized by the following technical scheme:
a coated paper comprises base paper and coating layers, wherein the coating layers are coated on two sides of the base paper; the coating layer comprises the following raw material components in parts by weight: 35-70 parts of rubber powder, 50-80 parts of nano calcium carbonate, 5-15 parts of microcrystalline cellulose, 0.5-1.5 parts of titanium dioxide, 0.1-0.5 part of dispersing agent and 1-3 parts of defoaming agent; the glue powder comprises starch and peach gum powder, and the mass ratio of the starch to the peach gum powder is (3: 2) - (25: 4).
By adopting the technical scheme, the nano calcium carbonate has small specific gravity which is about 2.0g/cm3The proportion of paper is not affected, the calcium carbonate resource distribution is wide, the content is large, the raw material supply is sufficient, and the nano calcium carbonate has a certain reinforcing effect when being used as pigment, so that the printability of the paper base can be improved. Microcrystalline cellulose (MCC) has special properties of lower polymerization degree, larger specific surface area and the like, and hydrogen bonds exist among molecules of the MCC and are associated with each other when being pressed, so that the MCC has high compressibility and is used for enhancing the adhesive property of the coating layer; and the microcrystalline cellulose and the nano calcium carbonate are mutually adsorbed and compatible to form a super-strong carrier of the rubber powder, so that the reduction of the viscosity of the rubber powder can be effectively prevented, the uniform adsorption and dispersion of the rubber powder are ensured, the adhesive force of the rubber powder and paper is improved, the problems of printing powder falling, decoloring and black shadow are effectively avoided, and the comprehensive printing performance of the coated paper is improved. In addition, the superstrong combination of nano calcium carbonate and microcrystalline cellulose has a high specific surface area, can effectively play the moisture absorption and damp-proof effects, and effectively avoids the problem that the service life of the paper base is affected by moisture. Peach gum is resin secreted from bark of peach or mountain peach of Rosaceae, also called peach oil, peach fat, peach flower, peach gum and peach gel, and is naturally secreted from peach tree or secreted from wound under external force, and has sufficient water solubility and proper viscosity. The peach gum powder and the starch are compounded according to a certain proportion to obtain the special gum powder, so that the quality is improvedThe adhesive force and the durability of the paper base and the coating layer are improved, and the printing performance of the coated paper is improved.
Preferably, the coating layer comprises the following raw material components in parts by weight: 45-60 parts of rubber powder, 60-70 parts of nano calcium carbonate, 8-12 parts of microcrystalline cellulose, 0.5-1 part of titanium dioxide, 0.2-0.4 part of dispersing agent and 1.5-2.5 parts of defoaming agent; the glue powder comprises starch and peach gum powder, and the mass ratio of the starch to the peach gum powder is (7: 3) - (9: 2).
By adopting the technical scheme, the component proportion of the coating layer is further optimized, the performance of the coating layer is further improved, the adhesive force between the coating layer and paper is improved, and the comprehensive printing performance of the coated paper is further improved.
Preferably, the mass ratio of the nano calcium carbonate to the microcrystalline cellulose is 5-15.
Preferably, the starch is tapioca starch or/and corn starch.
By adopting the technical scheme, the compatibility proportion of the nano calcium carbonate and the microcrystalline cellulose is controlled, so that the nano calcium carbonate and the microcrystalline cellulose are mutually adsorbed and act synergistically, and the performance of the super-strong carrier is exerted to the best. The adhesive powder has the advantages that the adhesive powder meets the adhesive property and has no harm to human bodies by using the pure natural plant glue and the plant starch.
Preferably, the base paper comprises the following raw material components in parts by weight: 60-90 parts of bleached sulfate hardwood pulp, 10-30 parts of bleached sulfate softwood pulp, 5-25 parts of bleached chemithermomechanical pulp and 5-20 parts of bleached willow wood pulp.
Preferably, the base paper comprises the following raw material components in parts by weight: 70-80 parts of bleached sulfate hardwood pulp, 15-25 parts of bleached sulfate softwood pulp, 10-20 parts of bleached chemithermomechanical pulp and 10-15 parts of bleached willow wood pulp.
By adopting the technical scheme, the bleached willow wood pulp is added into the raw material of the base paper, the willow fiber has the advantages of strong toughness, no upwarp, no crack, no moth and the like, and the bleached willow wood pulp is added and matched with the bleached chemithermomechanical pulp, the bleached sulfate hardwood pulp and the bleached sulfate softwood pulp, so that the bulk and stiffness of the coated paper are balanced, and the toughness, the forming effect and the printing effect of the coated paper are improved.
The invention also provides a processing method of the coated paper, which comprises the following operation steps:
(1) preparing a coating liquid: mixing the raw material components of the coating layer according to the weight ratio to prepare a coating liquid;
(2) preparing base paper: mixing raw materials of base paper according to a weight ratio, grinding into thick liquid, pulping, manufacturing paper, squeezing and drying to obtain the base paper;
(3) coating: and (3) uniformly coating the coating liquid on two sides of the base paper, coating twice, and then sequentially performing calendaring, drying and cooling to obtain the coated paper.
Preferably, in step (1), the coating solution is prepared by the following steps: mixing and grinding the nano calcium carbonate and the microcrystalline cellulose, adding the titanium dioxide, and uniformly stirring; adding a defoaming agent, and adjusting the pH value to 7-8; adding a dispersing agent and uniformly stirring; adding rubber powder and water, stirring and adjusting the solid content of the coating liquid to 55-65%.
By adopting the technical scheme, the prepared coating liquid is uniformly dispersed and has no bubbles; after the ink is coated on paper, a bright layer is formed on the paper, but the ink absorption is good, and the problem that the printing surface with large printing ink amount or multi-color overprinting is easy to cause sticking and dirt is solved. The coating liquid is uniformly coated on the surface of the surface layer and the bottom layer, so that the surface performance of the coated paper is improved, and the comprehensive printing performance of the coated paper is improved.
Preferably, in the step (3), after drying until the moisture content in the base paper is 5.5-7.0%, the temperature is reduced.
By adopting the technical scheme, the coating layer is ensured to be gradually and fully compounded with the base paper into a whole along with the evaporation of water, the water content is controlled to be 5.5-7.0%, and the adhesion strength of the coating layer is ensured to be optimal while the performance of the finished coated paper is ensured.
Preferably, in the step (3), the coating liquid is coated by surface doctor blade coating, and is coated for the first time, and is coated by surface coating after standing and drying, and is coated for the second time; the first coating weight is 12-15g/m2The second coating weight is 10-12g/m2。
By adopting the technical scheme, the coating layer can fully cover the base paper, the durability and the stability of the coated paper are improved, and the moisture-proof and bright effects of the coating layer can be exerted for a long time. The coating is carried out by times, the coating amount is gradually reduced, so that a thicker coating protective layer is formed on the base paper of the coating layer, the performance of the copper plate paper is improved, and meanwhile, the support is provided for the surface coating layer. The surface coating layer is thinner than the inner coating layer, so that the requirement of the coating layer is met, excessive or excessive thickness of the coating layer is avoided, powder is removed in the printing process, the black shadow phenomenon of the printing surface is avoided, and the comprehensive printing performance of the coated paper is improved.
In conclusion, the invention has the following beneficial effects:
(1) peach gum powder and starch are compounded according to a certain proportion to obtain special gum powder, so that the adhesive force and the durability of the paper base and the coating layer are improved, and the printing performance of the coated paper is improved;
(2) the microcrystalline cellulose and the nano calcium carbonate are mutually adsorbed and compatible to form a super-strong carrier of the rubber powder, so that the reduction of the viscosity of the rubber powder can be effectively prevented, the uniform adsorption and dispersion of the rubber powder are ensured, the adhesive force of the rubber powder and paper is improved, the problems of printing powder falling, decoloring and black shadow are effectively avoided, and the comprehensive printing performance of the coated paper is improved;
(3) the super-strong combination of the nano calcium carbonate and the microcrystalline cellulose has high specific surface area, can effectively play a role in absorbing moisture and preventing moisture, and effectively avoids the problem that the service life of the paper base is affected by moisture;
(4) the bleached willow wood pulp is added into the raw material of the base paper, the willow fiber has the advantages of being strong in toughness, free of warping and cracking, free of moth and the like, the bulk and stiffness of the coated paper are balanced by adding the bleached willow wood pulp, and the toughness, forming effect and printing effect of the coated paper are improved.
Detailed Description
The raw material components used in the invention are all commercial products and are not subjected to secondary processing treatment. The parts described in the following examples are parts by weight, and 1 part by weight represents 1 kg.
Example 1
A coated paper is prepared by the following operation steps:
(1) preparing a coating liquid: weighing 50 parts of nano calcium carbonate and 10 parts of microcrystalline cellulose, mixing and fully grinding, weighing 0.5 part of titanium dioxide, adding and uniformly stirring; adding 1 part of polyoxyethylene polyoxypropylene ether, adjusting the pH value to 7-8, adding 0.1 part of sodium dodecyl sulfate, and fully stirring and uniformly mixing; adding 21 parts of cassava starch, 14 parts of peach gum powder and a proper amount of water, and stirring to adjust the solid content of the coating liquid to 55%;
(2) preparing base paper: weighing 60 parts of bleached sulfate broad-leaved wood pulp, 10 parts of bleached sulfate softwood pulp, 5 parts of bleached chemithermomechanical pulp and 5 parts of bleached willow wood pulp, fully mixing, pulping and pulping; then, papermaking, squeezing and drying are carried out to obtain base paper;
(3) coating: coating the two sides of the base paper with the coating liquid uniformly, coating twice, and coating by a surface scraper type for the first time, wherein the coating weight is 12g/m2Standing and airing, and then coating for the second time in a surface coating mode, wherein the coating weight for the second time is 10g/m2And then, calendering and drying the raw paper until the moisture content in the raw paper is 5.5 percent, and cooling the raw paper to obtain the coated paper.
Example 2
A coated paper is prepared by the following operation steps:
(1) preparing a coating liquid: weighing 80 parts of nano calcium carbonate and 15 parts of microcrystalline cellulose, mixing and fully grinding, weighing 1.5 parts of titanium dioxide, adding and uniformly stirring; adding 3 parts of polyoxyethylene polyoxypropylene ether, adjusting the pH value to 7-8, adding 0.5 part of sodium hexametaphosphate, and fully stirring and uniformly mixing; adding 44 parts of cassava starch, 20.7 parts of corn starch, 9.3 parts of peach gum powder and a proper amount of water, and stirring to adjust the solid content of the coating liquid to 65%;
(2) preparing base paper: weighing 90 parts of bleached sulfate broad-leaved wood pulp, 30 parts of bleached sulfate softwood pulp, 25 parts of bleached chemithermomechanical pulp and 20 parts of bleached willow wood pulp, fully mixing, pulping and pulping; then, papermaking, squeezing and drying are carried out to obtain base paper;
(3) coating: coating the two sides of the base paper with the coating liquid uniformly, coating twice, and coating by a surface scraper type for the first time, wherein the coating weight is 15g/m2Standing and airing, and then coating for the second time in a surface coating mode, wherein the coating weight for the second time is 12g/m2And then, calendering and drying the raw paper until the moisture content in the raw paper is 7.0 percent, and cooling the raw paper to obtain the coated paper.
Example 3
A coated paper is prepared by the following operation steps:
(1) preparing a coating liquid: weighing 75 parts of nano calcium carbonate and 5 parts of microcrystalline cellulose, mixing and fully grinding, weighing 0.5 part of titanium dioxide, adding and uniformly stirring; adding 1.5 parts of polyoxypropylene glycerol ether, adjusting the pH value to 7-8, adding 0.2 part of sodium polymethacrylate, and fully stirring and uniformly mixing; adding 31.5 parts of corn starch, 13.5 parts of peach gum powder and a proper amount of water, and stirring to adjust the solid content of the coating liquid to 60%;
(2) preparing base paper: weighing 70 parts of bleached sulfate broad-leaved wood pulp, 15 parts of bleached sulfate softwood pulp, 10 parts of bleached chemithermomechanical pulp and 10 parts of bleached willow wood pulp, fully mixing, pulping and pulping; then, papermaking, squeezing and drying are carried out to obtain base paper;
(3) coating: coating the two sides of the base paper with the coating liquid uniformly, coating twice, and coating by a surface scraper type for the first time, wherein the coating weight is 13g/m2Standing and airing, and then coating for the second time in a surface coating mode, wherein the coating weight for the second time is 11g/m2And then, calendering and drying the raw paper until the moisture content in the raw paper is 6.0 percent, and cooling the raw paper to obtain the coated paper.
Example 4
A coated paper is prepared by the following operation steps:
(1) preparing a coating liquid: weighing 60 parts of nano calcium carbonate and 8 parts of microcrystalline cellulose, mixing and fully grinding, weighing 0.5 part of titanium dioxide, adding and uniformly stirring; adding 2.5 parts of polyoxypropylene glycerol ether, adjusting the pH value to 7-8, adding 0.4 part of sodium polymethacrylate, and fully stirring and uniformly mixing; adding 49.1 parts of cassava starch, 10.9 parts of peach gum powder and a proper amount of water, and stirring to adjust the solid content of the coating liquid to 58%;
(2) preparing base paper: weighing 80 parts of bleached sulfate broad-leaved wood pulp, 25 parts of bleached sulfate softwood pulp, 20 parts of bleached chemithermomechanical pulp and 15 parts of bleached willow wood pulp, fully mixing, pulping and pulping; then, papermaking, squeezing and drying are carried out to obtain base paper;
(3) coating: coating the two sides of the base paper with the coating liquid uniformly, coating twice, and coating by a surface scraper type for the first time, wherein the coating weight is 14g/m2Standing and airing, and then coating for the second time in a surface coating mode, wherein the coating weight for the second time is 11g/m2And then, calendering and drying the raw paper until the moisture content in the raw paper is 6.5 percent, and cooling the raw paper to obtain the coated paper.
Example 5
A coated paper is prepared by the following operation steps:
(1) preparing a coating liquid: weighing 70 parts of nano calcium carbonate and 12 parts of microcrystalline cellulose, mixing and fully grinding, weighing 1 part of titanium dioxide, adding and uniformly stirring; adding 2 parts of polyoxypropylene glycerol ether, adjusting the pH value to 7-8, adding 0.3 part of sodium polymethacrylate, and fully stirring and uniformly mixing; adding 40 parts of cassava starch, 10 parts of peach gum powder and a proper amount of water, and stirring to adjust the solid content of the coating liquid to 63%;
(2) preparing base paper: weighing 75 parts of bleached sulfate broad-leaved wood pulp, 20 parts of bleached sulfate softwood pulp, 15 parts of bleached chemithermomechanical pulp and 12 parts of bleached willow wood pulp, fully mixing, pulping and pulping; then, papermaking, squeezing and drying are carried out to obtain base paper;
(3) coating: coating the two sides of the base paper with the coating liquid uniformly, coating twice, and coating by a surface scraper type for the first time, wherein the coating weight is 14g/m2Standing and airing, and then coating for the second time in a surface coating mode, wherein the coating weight for the second time is 11g/m2And then, calendering and drying the raw paper until the moisture content in the raw paper is 6.5 percent, and cooling the raw paper to obtain the coated paper.
Comparative example 1
Comparative example 1 is different from example 5 in that the coating layer raw material composition has no microcrystalline cellulose, and the rest is the same as example 5.
Comparative example 2
Comparative example 2 is different from example 5 in that the coating layer raw material composition does not have nano calcium carbonate, and the rest is the same as example 5.
Comparative example 3
Comparative example 3 is different from example 5 in that 25 parts of tapioca starch and 25 parts of peach gum powder are added in the preparation of coating liquid, and the rest is the same as example 5.
Comparative example 4
Comparative example 4 is different from example 5 in that 43.3 parts of tapioca starch and 6.7 parts of peach gum powder were added in the preparation of coating liquid, and the rest was the same as example 5.
Comparative example 5
Comparative example 4 is different from example 5 in that 48 parts of nano calcium carbonate and 12 parts of microcrystalline cellulose were added in preparation of the coating liquid, and the rest was the same as example 5.
Comparative example 6
Comparative example 6 is different from example 5 in that 80 parts of nano calcium carbonate and 5 parts of microcrystalline cellulose were added in preparation of the coating liquid, and the rest was the same as example 5.
Comparative example 7
Comparative example 7 differs from example 5 in that bleached willow wood pulp was not added to the base paper stock composition, and the rest is the same as example 5.
Comparative example 8
Comparative example 8 is different from example 5 in that, in step (3), after drying to a base paper moisture content of 5%, the temperature reduction operation is performed, and the rest is the same as in example 5.
Comparative example 9
Comparative example 9 is different from example 5 in that, in step (3), after drying to a base paper moisture content of 7.5%, the temperature reduction operation is performed, and the rest is the same as in example 5.
The coated papers of examples 1-5 and comparative examples 1-9 were tested for their performance according to the test standards and related methods of GB/T10335.4-2005, the specific test results are shown in Table 1. Wherein the printed surface strength is measured for low viscosity inks.
TABLE 1 results of testing the properties of coated papers of examples 1 to 5 and comparative examples 1 to 9
As can be seen from Table 1, the coated paper of the present invention has good comprehensive printing performance and various performance indexes all reach the standards of superior products. And as can be seen from comparative examples 1 and 2, comparative examples 5 and 6, and example 5, the nano calcium carbonate and microcrystalline cellulose of the present invention play a crucial role in the printing performance of coated paper and the surface performance of paperboard, and if either one of the nano calcium carbonate and microcrystalline cellulose is absent or the ratio of the nano calcium carbonate and microcrystalline cellulose is outside the range of the present invention, the printing performance is seriously reduced. The effect sum of the single nano calcium carbonate or the single microcrystalline cellulose is smaller than the combination property of the nano calcium carbonate and the nano calcium carbonate, and the micro-crystalline cellulose and the nano calcium carbonate are proved to be successfully adsorbed and combined to form a super-strong carrier of the rubber powder, so that the reduction of the viscosity of the rubber powder can be effectively prevented, the uniform adsorption and dispersion of the rubber powder can be ensured, the adhesive force of the rubber powder and paper can be improved, the problems of printing powder falling, decoloring and black shadow can be effectively avoided, and the combination printing property of the coated paper can be improved. From comparative examples 3 and 4, in combination with example 5, it is clear that the proportion of the rubber powder in the present invention is important for improving the printing performance of coated paper. As can be seen from comparative example 7, the bleached willow wood pulp has an important influence on the stiffness of the coated paper, and the bleached willow wood pulp is absent, so that the transverse stiffness of the coated paper is reduced from a superior product to a qualified product, and the printing effect is reduced. As can be seen from comparative examples 8 and 9, the moisture content of the dry-set paper during the preparation process, which is outside the range of the present invention, affects the overall printing performance of the coated paper.
The coated papers of examples 1-5 and comparative examples 1-9 were subjected to a moisture resistance test using the following test methods: preparing the coated paper into test pieces of 250mm multiplied by 250mm, and measuring the initial water content H1 of each test piece; suspending each test piece in an environmental climate box with the temperature of 50 ℃ and the relative humidity of 90% for 48H, then taking out the test piece, absorbing water vapor on the surface of the test piece by using filter paper, suspending the test piece in an environment with the temperature of 23 ℃ and the RH 50% for 10min, and measuring the final water content H2, wherein the moisture resistance H = H2-H1; the test piece was suspended at 23 ℃ in an atmosphere of RH 50% for 72 hours, and the presence or absence of mold on the surface of the test piece was observed. The results are shown in Table 2.
Table 2 moisture resistance test results of examples 1 to 5 and comparative examples 1 to 9 coated papers
As can be seen from Table 2, the super-strong combination of nano calcium carbonate and microcrystalline cellulose has a high specific surface area, can effectively absorb moisture and prevent moisture, and effectively avoids the problem that coated paper is affected with damp and mildewed. The absence of either nano calcium carbonate or microcrystalline cellulose, which is outside the range of the present invention, affects the moisture and mildew resistance of coated paper (comparative examples 1, 2, 5 and 6). In addition, as can be seen from the comparison of example 5 with comparative examples 8 and 9, the moisture control in the drying and dehumidifying stage of the base paper in the process of making the coated paper has a great influence on the moisture and mildew resistance of the finally prepared coated paper.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (10)
1. The coated paper is characterized by comprising base paper and coating layers, wherein the coating layers are coated on two sides of the base paper; the coating layer comprises the following raw material components in parts by weight: 35-70 parts of rubber powder, 50-80 parts of nano calcium carbonate, 5-15 parts of microcrystalline cellulose, 0.5-1.5 parts of titanium dioxide, 0.1-0.5 part of dispersing agent and 1-3 parts of defoaming agent; the glue powder comprises starch and peach gum powder, and the mass ratio of the starch to the peach gum powder is (3: 2) - (25: 4).
2. The coated paper according to claim 1, wherein the coating layer comprises the following raw material components in parts by weight: 45-60 parts of rubber powder, 60-70 parts of nano calcium carbonate, 8-12 parts of microcrystalline cellulose, 0.5-1 part of titanium dioxide, 0.2-0.4 part of dispersing agent and 1.5-2.5 parts of defoaming agent; the glue powder comprises starch and peach gum powder, and the mass ratio of the starch to the peach gum powder is (7: 3) - (9: 2).
3. Coated paper according to claim 1, characterized in that: the mass ratio of the nano calcium carbonate to the microcrystalline cellulose is 5-15.
4. Coated paper according to claim 1, characterized in that: the starch is cassava starch or/and corn starch.
5. Coated paper according to claim 1, characterized in that: the base paper comprises the following raw material components in parts by weight: 60-90 parts of bleached sulfate hardwood pulp, 10-30 parts of bleached sulfate softwood pulp, 5-25 parts of bleached chemithermomechanical pulp and 5-20 parts of bleached willow wood pulp.
6. Coated paper according to claim 5, characterized in that: the base paper comprises the following raw material components in parts by weight: 70-80 parts of bleached sulfate hardwood pulp, 15-25 parts of bleached sulfate softwood pulp, 10-20 parts of bleached chemithermomechanical pulp and 10-15 parts of bleached willow wood pulp.
7. A method of processing coated paper according to claim 5, characterized in that it comprises the following operative steps:
(1) preparing a coating liquid: mixing the raw material components of the coating layer according to the weight ratio to prepare a coating liquid;
(2) preparing base paper: mixing raw materials of base paper according to a weight ratio, grinding into thick liquid, pulping, manufacturing paper, squeezing and drying to obtain the base paper;
(3) coating: and (3) uniformly coating the coating liquid on two sides of the base paper, coating twice, and then sequentially performing calendaring, drying and cooling to obtain the coated paper.
8. The process according to claim 7, wherein in the step (1), the coating liquid is prepared by: mixing and grinding the nano calcium carbonate and the microcrystalline cellulose, adding the titanium dioxide, and uniformly stirring; adding a defoaming agent, and adjusting the pH value to 7-8; adding a dispersing agent and uniformly stirring; adding rubber powder and water, stirring and adjusting the solid content of the coating liquid to 55-65%.
9. The process of claim 7, wherein: and (3) drying until the moisture content in the base paper is 5.5-7.0%, and then cooling.
10. The process of claim 7, wherein: in the step (3), the coating liquid is coated for the first time through surface scraper type coating, and is coated for the second time by adopting a surface coating mode after standing and drying; the first coating weight is 12-15g/m2The second coating weight is 10-12g/m2。
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| CN201811056560.3A CN110886136A (en) | 2018-09-11 | 2018-09-11 | Coated paper and processing method thereof |
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| CN201811056560.3A CN110886136A (en) | 2018-09-11 | 2018-09-11 | Coated paper and processing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115613387A (en) * | 2022-11-11 | 2023-01-17 | 岳阳林纸股份有限公司 | Mark paper and manufacturing method thereof |
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